iphone back-up power

battery backup for iPhone from shenzhen.
thanks to @underexpose.
i haven’t try with my phone yet, but according to its package; it has built-in usb (the tiny one which can be folded nicely with the battery) it can be charged directly from usb wall charger fully within two hours and four hours with usb port on computer. it features power checker button with four indicator leds. capacity 1000ma, rechargeable up to 1,000 times. made in china, yea